What SV was talking about was putting the anchor somewhere at low tide and then positioning a small boat on top of it as soon as the tide rises enough. You need a line run through something on the anchor so you have both ends to form a loop all the way around the hull of the boat. Tie it off tightly as soon as you can position the boat over the anchor and then as the tide rises, so will the anchor. Then just take it where you want it and cut the line, making sure you have your chain/line attached to the mooring ball or whatever you are using. It's best to use a non-stretch type of line. You obviously need a fairly large tide to do this, but you don't need a very big boat, a 12' aluminum row boat can carry a lot of weight.